Just say no to those electric mosquito zappers. Several studies have shown that they are inefficient at killing the pesky biting insects, but great at turning beneficial ecologically important bugs into charred insects.
Part of the problem is that traditional zappers merely emit UV light as an attractant, however mosquitoes could care less about the light. Newer models, such as the Mosquito Magnet, release CO2, which does excite the biting bugs. All and all they work better, but do cost a bundle.
I still recommend just using a good old eco-friendly spray to keep those mosquitoes at bay.